Since several students in the 2nd and 3rd hours performed poorly on the test for mole-mass conversion, these two classes will be given an opportunity for a retake.
Those individuals who performed very well or above average will have the choice to opt out. They will use the time to read about our next topic on pages 341-346, which entails percent composition and empirical formula as a preview to our class discussion once the other students finish doing their retakes.